audio/telephone-event Parameters

Last Updated
2011-12-07
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Registry included below

Event Code Registry

Registration Procedure(s)
Specification Required and Expert Review
Expert(s)
Tom Taylor
Reference
[RFC4733]
Available Formats

CSV
Event Code Event Name Reference
0 DTMF digit "0" [RFC4733]
1 DTMF digit "1" [RFC4733]
2 DTMF digit "2" [RFC4733]
3 DTMF digit "3" [RFC4733]
4 DTMF digit "4" [RFC4733]
5 DTMF digit "5" [RFC4733]
6 DTMF digit "6" [RFC4733]
7 DTMF digit "7" [RFC4733]
8 DTMF digit "8" [RFC4733]
9 DTMF digit "9" [RFC4733]
10 DTMF digit "*" [RFC4733]
11 DTMF digit "#" [RFC4733]
12 DTMF digit "A" [RFC4733]
13 DTMF digit "B" [RFC4733]
14 DTMF digit "C" [RFC4733]
15 DTMF digit "D" [RFC4733]
16 Reserved
17-22 Unassigned
23 CRdSeg: second segment of V.8 bis CRd signal [RFC4734]
24 CReSeg: second segment of V.8 bis CRe signal [RFC4734]
25 MRdSeg: second segment of V.8 bis MRd signal [RFC4734]
26 MReSeg: second segment of V.8 bis MRe signal [RFC4734]
27 V32AC: A pattern of bits modulated at 4800 bits/s, emitted by a V.32/V.32bis answering terminal upon detection of the AA pattern. [RFC4734]
28 V8bISeg: first segment of initiating V.8 bis signal [RFC4734]
29 V8bRSeg: first segment of responding V.8 bis signal [RFC4734]
30 V21L300: 300 bits/s low channel V.21 indication [RFC4734]
31 V21H300: 300 bits/s high channel V.21 indication [RFC4734]
32 ANS (V.25 Answer tone). Also known as CED (T.30 Called tone). [RFC4734]
33 /ANS (V.25 Answer tone after phase shift). Also known as /CED (T.30 Called tone after phase shift) [RFC4734]
34 ANSam (V.8 amplitude modified Answer tone) [RFC4734]
35 /ANSam (V.8 amplitude modified Answer tone after phase shift) [RFC4734]
36 CNG (T.30 Calling tone) [RFC4734]
37 V.21 channel 1 (low channel), '0' bit [RFC4734]
38 V.21 channel 1, '1' bit. Also used for ESiSeg (second segment of V.8 bis ESi signal). [RFC4734]
39 V.21 channel 2, '0' bit [RFC4734]
40 V.21 channel 2, '1' bit. Also used for ESrSeg (second segment of V.8 bis ESr signal). [RFC4734]
41-48 Reserved
49 CT (V.25 Calling Tone) [RFC4734]
50-51 Unassigned
52 ANS2225: 2225 Hz indication for text telephony [RFC4734]
53 CI (V.8 Call Indicator signal preamble) [RFC4734]
54 V.21 preamble flag (T.30) [RFC4734]
55 V21L110: 110 bits/s V.21 indication for text telephony [RFC4734]
56 B103L300: Bell 103 low channel indication for text telephony [RFC4734]
57 V23Main: V.23 main channel indication for text telephony [RFC4734]
58 V23Back: V.23 back channel indication for text telephony [RFC4734]
59 Baud4545: 45.45 bits/s Baudot indication for text telephony [RFC4734]
60 Baud50: 50 bits/s Baudot indication for text telephony [RFC4734]
61 VBDGen: Tone patterns indicative of use of an unidentified modem type [RFC4734]
62 XCIMark: A pattern of bits modulated in the V.23 main channel, emitted by a V.18 calling terminal. [RFC4734]
63 V32AA: A pattern of bits modulated at 4800 bits/s, emitted by a V.32/V.23bis calling terminal. [RFC4734]
64-88 Reserved
90-95 Unassigned
96-112 Reserved
113-114 Unassigned
115 North American SIT Segment 1 Low [GR-674]
116 North American SIT Segment 1 High [GR-674]
117 North American SIT Segment 2 Low [GR-674]
118 North American SIT Segment 2 High [GR-674]
119 North American SIT Segment 3 [GR-674]
120 North American Coin Deposit [GR-506]
121 Continuity check-tone [RFC5244]
122 Continuity verify-tone [RFC5244]
123 MF Code 11 (SS No. 5) or KP3P/ST3P (R1) [RFC5244]
" North American Ringback [GR-506]
124 MF KP (SS No. 5) or KP1 (R1) [RFC5244]
" North American Coin Return [GR-506]
125 MF KP2 (SS No. 5) or KP2P/ST2P (R1) [RFC5244]
126 MF ST (SS No. 5 and R1) [RFC5244]
" North American Coin Collect / Operator Released [GR-506]
127 MF Code 12 (SS No. 5) or KP'/STP (R1) [RFC5244]
128 SS No. 5 or R1 digit "0" [RFC5244]
" North American Operator Attached [GR-506]
129 SS No. 5 or R1 digit "1" [RFC5244]
130 SS No. 5 or R1 digit "2" [RFC5244]
" North American Coin Collect [GR-506]
131 SS No. 5 or R1 digit "3" [RFC5244]
132 SS No. 5 or R1 digit "4" [RFC5244]
133 SS No. 5 or R1 digit "5" [RFC5244]
134 SS No. 5 or R1 digit "6" [RFC5244]
135 SS No. 5 or R1 digit "7" [RFC5244]
136 SS No. 5 or R1 digit "8" [RFC5244]
" North American Operator Released [GR-506]
137 SS No. 5 or R1 digit "9" [RFC5244]
138-143 Reserved
144 ABCD signalling state '0000' [RFC5244]
145 ABCD signalling state '0001' [RFC5244]
146 ABCD signalling state '0010' [RFC5244]
147 ABCD signalling state '0011' [RFC5244]
148 ABCD signalling state '0100' [RFC5244]
149 ABCD signalling state '0101' [RFC5244]
150 ABCD signalling state '0110' [RFC5244]
151 ABCD signalling state '0111' [RFC5244]
152 ABCD signalling state '1000' [RFC5244]
153 ABCD signalling state '1001' [RFC5244]
154 ABCD signalling state '1010' [RFC5244]
155 ABCD signalling state '1011' [RFC5244]
156 ABCD signalling state '1100' [RFC5244]
157 ABCD signalling state '1101' [RFC5244]
158 ABCD signalling state '1110' [RFC5244]
159 ABCD signalling state '1111' [RFC5244]
160-168 Reserved
169 Unassigned
170-173 Reserved
174 Metering pulse [RFC5244]
175 Trunk unavailable [RFC5244]
176 MFC forward signal 1 [RFC5244]
177 MFC forward signal 2 [RFC5244]
178 MFC forward signal 3 [RFC5244]
179 MFC forward signal 4 [RFC5244]
180 MFC forward signal 5 [RFC5244]
181 MFC forward signal 6 [RFC5244]
182 MFC forward signal 7 [RFC5244]
183 MFC forward signal 8 [RFC5244]
184 MFC forward signal 9 [RFC5244]
185 MFC forward signal 10 [RFC5244]
186 MFC forward signal 11 [RFC5244]
187 MFC forward signal 12 [RFC5244]
188 MFC forward signal 13 [RFC5244]
189 MFC forward signal 14 [RFC5244]
190 MFC forward signal 15 [RFC5244]
191 MFC backward signal 1 [RFC5244]
192 MFC backward signal 2 [RFC5244]
193 MFC backward signal 3 [RFC5244]
194 MFC backward signal 4 [RFC5244]
195 MFC backward signal 5 [RFC5244]
196 MFC backward signal 6 [RFC5244]
197 MFC backward signal 7 [RFC5244]
198 MFC backward signal 8 [RFC5244]
199 MFC backward signal 9 [RFC5244]
200 MFC backward signal 10 [RFC5244]
201 MFC backward signal 11 [RFC5244]
202 MFC backward signal 12 [RFC5244]
203 MFC backward signal 13 [RFC5244]
204 MFC backward signal 14 [RFC5244]
205 MFC backward signal 15 [RFC5244]
206 A bit signalling state '0' [RFC5244]
207 A bit signalling state '1' [RFC5244]
208 AB bit signalling state '00' [RFC5244]
209 AB bit signalling state '01' [RFC5244]
210 AB bit signalling state '10' [RFC5244]
211 AB bit signalling state '11' [RFC5244]
212-255 Unassigned